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Nitrogen-rich porous carbon desulfurizer and preparation method thereof

A technology of desulfurization agent and porous carbon, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve the problems of low content of nitrogen-containing functional groups and achieve rich nitrogen-containing functional groups, improved desulfurization capacity, and wide application range. Effect

Active Publication Date: 2013-12-11
成都达奇科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problems existing in the prior art, the present invention aims to provide a nitrogen-rich porous carbon material desulfurizer with abundant nitrogen-containing functional groups on the surface and a preparation method thereof, so as to overcome the problems existing in the nitrogen-containing porous carbon material desulfurizer prepared by the prior art. The problem of low content of nitrogen-containing functional groups on the surface of carbon materials

Method used

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  • Nitrogen-rich porous carbon desulfurizer and preparation method thereof
  • Nitrogen-rich porous carbon desulfurizer and preparation method thereof
  • Nitrogen-rich porous carbon desulfurizer and preparation method thereof

Examples

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Embodiment 1

[0033] Soak the activated carbon fiber in a nitric acid solution with a mass concentration of 30%, stir it in a constant temperature water bath at 60°C for 2 hours, take it out, rinse the activated carbon fiber with deionized water to pH=6-7, and then dry it in an oven at 105°C overnight . Dissolve 100 grams of dicyandiamide in 200 milliliters of ethanol solution with a mass concentration of 50% to form a dicyandiamide solution. Pour 100 grams of acid-washed activated carbon fibers into the above-mentioned dicyandiamide solution, heat while stirring at 60° C., slowly evaporate ethanol and moisture, and then dry overnight at 105° C. in an oven. Put the activated carbon fiber loaded with dicyandiamide into a high-temperature calcination furnace, under the condition of nitrogen protection, raise the temperature from room temperature to 750°C at a rate of 5°C / min, and keep it at 750°C for 1 hour, then cool Finally, a nitrogen-rich activated carbon fiber desulfurizer with dicyandi...

Embodiment 2

[0041] Soak 10-20 mesh granular activated carbon in a nitric acid solution with a mass concentration of 20%, and stir in a constant temperature water bath at 60°C for 3 hours. The acid-washed granular activated carbon was rinsed with deionized water to pH=6-7, and then dried overnight in an oven at 105°C. Dissolve 5 grams of melamine in 100 milliliters of water to make a melamine solution. Pour 30 grams of acid-washed 10-20 mesh granular activated carbon into the above-mentioned melamine solution, heat while stirring at 60°C, slowly evaporate the water, and then dry in an oven at 105°C overnight. The granular activated carbon loaded with melamine was placed in a high-temperature calciner, and under the condition of nitrogen protection, the temperature was raised from room temperature to 800 °C at a heating rate of 5 °C / min, and kept at 800 °C for 1 hour. After cooling, the following Nitrogen-rich granular activated carbon desulfurizer with melamine as nitrogen source and surf...

Embodiment 3

[0049] Soak 10-20 mesh granular activated carbon in a nitric acid solution with a mass concentration of 50%, and react at 60°C for 1 hour. The acid-washed granular activated carbon was rinsed with deionized water to pH=6-7, and then dried overnight in an oven at 105°C. Dissolve 200 grams of urea in 1000 milliliters of 50% ethanol aqueous solution to form a urea solution. Pour 100 grams of acid-washed granular activated carbon into the above-mentioned urea solution, heat while stirring at 60°C, slowly evaporate ethanol and water, and then dry in an oven at 105°C overnight. The activated carbon loaded with urea was placed in a high-temperature calciner, and under the condition of nitrogen protection, the temperature was raised from room temperature to 850 °C at a heating rate of 5 °C / min, and kept at 850 °C for 1 hour. After cooling, urea was obtained. Nitrogen-enriched granular activated carbon desulfurizer with surface nitrogen doping as nitrogen source.

[0050] Elemental a...

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Abstract

The invention discloses a nitrogen-rich porous carbon desulfurizer and a preparation method thereof. The desulfurizer comprises a porous carbon material subjected to surface oxidation preprocessing and nitrogen-containing functional groups fixed to the surface of the porous carbon material by soaking and sintering, wherein the mass content of nitrogen element is 0.5-5.0% of the total mass of the nitrogen-rich porous carbon desulfurizer. The preparation method comprises the following steps: soaking the porous carbon material in a strong oxidant solution for surface oxidation preprocessing, mixing the strong oxidant solution with a nitrogen-containing compound solution, fully soaking, evaporating to remove the solvent, drying, putting the dried material into a high-temperature calcining furnace, calcining at the temperature of 400-1000 DEG C under the protection of inert gas, decomposing a nitrogen-containing compound, enabling the nitrogen-containing compound to react with the surface of active carbon, fully calcining, cooling to obtain the nitrogen-rich porous carbon desulfurizer. According to the nitrogen-rich porous carbon desulfurizer prepared by the preparation method, the content of the nitrogen functional groups on the surface of the carbon material is high and the desulfurization capacity is increased by 1.5-2 times in comparison with that of the active carbon desulfurizer which is directly subjected to surface nitrogen modification without surface oxidation preprocessing.

Description

technical field [0001] The invention relates to desulfurizing agent technology, in particular to a porous carbon desulfurizing agent containing abundant nitrogen-containing functional groups on the surface for removing sulfur dioxide from industrial exhaust gas and a preparation method thereof, belonging to the fields of material science and engineering, chemical engineering and environmental protection. Background technique [0002] my country SO 2 The pollution is very serious, and the SO emitted into the atmosphere every year 2 More than 20 million tons, ranking first in the world. by SO 2 The area of ​​acid rain pollution caused by discharge has reached 30% of the country's land area, which has become an important factor restricting the sustainable development of my country's economy and society. Therefore, increasing SO 2 Pollution control efforts are very urgent. [0003] The wet flue gas desulfurization technology represented by the limestone-gypsum method is cur...

Claims

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Application Information

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IPC IPC(8): B01D53/82B01D53/50
Inventor 刘勇军尹华强程琰李新李建军
Owner 成都达奇科技股份有限公司
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